Notice unused code in a workspace

[stevenroose]

What it does

A lot of projects have a workspace with multiple crates. This means that they will define most of their types as pub instead of pub(crate). However this means that all crates are libraries and thus cargo won't warn you for unused code within the crate.

So it would be useful if we'd have a way to find unused code within a workspace instead of just within a crate.

Categories (optional)

• Kind: clippy::nursery

Drawbacks

Could point out unused code in some crates that are intended for usage outside the workspace.

[flip1995]

This is impossible to do for Clippy, since it would require a global analysis.

In addition to that, Clippy (also cargo and rustc) can't know, if a pub function is unused, since there could be some other crate out there, not in the workspace, that uses this pub function.